By 'vaporized on impact', are you talking about the Red-square crash, the one in the news, or both?
In the news article, the tail of the plane looked relatively intact and unharmed. I can't seem to think of it in a sort of hollywood-esque ball of exploding flame. <shrug> It just doesn't look like it to this layman.
But what if the chem/bio stuff was stored in an aerosol form in a container? A metal container might well prevent the destruction of the material, and after the crash might leak...
